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Extra resources for All the math you'll ever need: a self-teaching guide
Percentages can be expressed in fraction and decimal form-for instance, 1% is 1/100 or one-hundredth. How much is 4%? Right-it's 4/100. And how much is 43%? It's 43/100. How much is 43/100 in decimal form? 43. 43. 76. To convert a decimal to a percentage, move the decimal point two places to the right and add a percentage sign. 23 to a percentage. It's 23%. 06 to a percent. It's 6%. 375 to a percent. 5%. (See the box on p. '') You probably noticed that all of the fractions so far had 100 as the bottom number.
Here's another one. Problem: Solution: 42 43 Â < previous page < previous page page_34 page_35 next page > next page > Page 35 By now it should be clear that in order to divide we need to make the divisor, or the number to the left, into a whole number. We do that by moving the decimal point one or more places to the right. And what we do to the divisor, we need to do to the dividend, or the number under the division symbol. Self-Test 2 Answers Â < previous page < previous page page_35 page_36 next page > next page > 43 44 Page 36 7 Converting Fractions into Decimals and Decimals into Fractions Virtually every fraction can be expressed as a decimal, and vice versa.
3 by 10. Then we put 3 over 10, which divided 3 by 10. 3 as a fraction: 45 46 Any number may be written over 1 because it does not change its value1 divided into any number is that number. 3 over 1? So that we could make it into a fraction. 3 by 10. Invoking the famous law of arithmeticwhat you do to the top of a fraction, you must do to the bottomwe multiply the bottom by 10: Want to try one on your own? 57 into a fraction. 833. Solution: Now we can step back and generalize. 3), then we remove the decimal point and divide by 10.